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Image 37 of Annual report. 1923

Part of Kentucky Agricultural Experiment Station

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Kentucky Agricultural Experiment Station 31 f· young plants at weeding tin1e. The beds which were found to it be free fro1n infection were all cared for by men who did not —d chew tobacco. A large majority of growers cl1ew tobacco and most of those questioned chewed the natural leaf of the pre- yf vious year ’s crop. lt is known that the causal organisms of S- both these diseases live thru the winter in cured tobacco leaves. 55 It has since been demonstrated that spitting diseased tobacco .0 on the )'Olll]g` plants i11 the bed results in infection. 1- Mosaic Disease of Tobacco and the Eradication of the d , Weed Carriers. Tests in 1922 demonstrated that the mosaic h D disease of tobacco is over-wintered i11 the bull 11ettle (Solan-uni 10 carolinernsc) and in the ground cherry (Plzysulis sp.), Studies 1- are being conducted to determine the extent to wl1icl1 tl1c .e mosaic disease may be co11t1·olled by the elin1i11atio11 of these d weed carriers from the pla11t bed. Eradication of tl1c weeds 6 is not easily accomplished. Plowing followed by steaming e the beds does 1lOt kill them. Tl1e weeds develop a tap root t- which sometimes extends to a depth of 28 inches. Cutting the ie tap root off 16 inches below the surface of the ground Blld till- y ing in t]1e dirt is 11ot sufficient to destroy tl1c plant. So far »t the only satisfactory 1netl1od fou11d for ridding the beds of .t these weeds is by digging tl1en1 out with a two-jawed post hole i e digger. XVith tl1is tool they 1nay be removed completely a11d e ` quite rapidly. Clover Diseases Related to Productivity of Soil. A con- 4; tinuation of the study of clover diseases Oll the Lexington, ;- Berea and Campbellsville soil fields, particularly witl1 refer- S ence to the root systems, has sl1ow11 that while all root systems l- are diseased, the extent increases witl1 decreased productivity L- of the soil and witl1 the age of the plant, Zllld the vigor of the S plant expresses in a general way the eo11dition of tl1c root t_ system. The study of tl1c stand of clove1· plants bei11g made d in co1111ection with tl1ese disease investigations has indicated gi that weather is a factor of considerable llli;lll01lCC in determin- §- ing the stand at the end of the first season 011 the least pro- ;_ duetive soil, but that it has much less eEeet when the clover C is growing on the more productive soils.

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